The ingredients in food often have a similar effect on your brain and its chemical reactions as drugs, according to the American Society of Addiction Medicine.

Digestive enzymes help your body break down fats, proteins and carbohydrates. Your digestive system uses natural enzymes, but in some cases taking certain enzyme supplements can help improve digestion. These enzymes include papain and bromelain from papaya and pineapple fruit, which help to digest proteins.

Refined carbs and sugar can be very addictive. A review of the research published in the "Current Opinion in Clinical Nutrition and Metabolic Care" reported that lab rats, as well as humans, can find sugar even more rewarding than cocaine.

Caffeine blocks brain receptors that can dilate the blood vessels. This may lead to some withdrawal symptoms, such as headaches. Teas, energy drinks, colas and chocolate contain caffeine, though in smaller doses. People who consume those products regularly may have withdrawal symptoms when they try to stop.